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Finding the Fourth Proportional to 455.52, 679.44 and 387.44

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Solution

The fourth proportional to 455.52, 679.44 and 387.44 is: 577.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.52 : 679.44 = 387.44 : x
  2. Step 2: Convert to fraction form
    455.52/679.44 = 387.44/x
  3. Step 3: Cross multiply
    455.52x = 679.44 × 387.44
  4. Step 4: Simplify right side
    455.52x = 263,242.23
  5. Step 5: Solve for x
    x = 263,242.23/455.52
  6. Step 6: Final answer
    x = 577.89

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.